Taivo A Taiwan Mandarin dictionary

鍃孔

huōkǒng

ㄏㄨㄛ ㄎㄨㄥˇ

Simplified 锪孔

  1. 1an enlargement at the outer end of a drilled hole, either funnel-shaped (a countersink) or cylindrical (a counterbore)

Keep 鍃孔 and it comes back until you know it.

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